Here's some concept pictures that show the development of the vex citadel. I think you'll like them.
Here is the first picture:
[url=http://vignette1.wikia.nocookie.net/destinypedia/images/a/a2/Citadel.jpg/revision/latest?cb=20130322015500]Vex citadel concept: 1[/url]
Very cool. Rather large too. Really curious to see what's at the heart of that.
Here's pic number 2:
[url=http://conceptartworld.com/wp-content/uploads/2014/09/Destiny_Concept_Art_Jesse_van_Dijk_citadel2.jpg]Vex citadel concept: 2[/url]
Little closer to what we know and love, aside from that big lift on the left side.
And here's pic numbe- HOLY SHIT!
[url=https://pbs.twimg.com/media/B-ZIcdSCQAABNbN.jpg]Vex citadel concept: The hell happened here?[/url]
Well that was......uh......what? I don't quite remember this citadel. Did I miss a strike ride-along with shaxx or what the hell happened? Wait, I see a dot of blue. Did Shaxx fckn fist of havoc the citadel?!
I...I gotta go sit down for a moment, I'll be right back.
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[quote]Very cool. Rather large too. Really curious to see what's at the heart of that.[/quote] Said everyone before the game came out looking forward to exploring the vast wide adventurous world of Destiny like it was advertised... only to realise we have to turn back in 5..4..3..2..1.....